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The California-based company Micromidas has a two-pronged environmental mission: reuse sewage that usually ends up in landfills to create biodegradable plastic. I spoke this week with Ryan Smith, the company’s chief technical officer, about the process — and the future of plastics.
Here’s how it works: after removing water from sewage, the solids (shudder) are put through a system wherein even more water is removed (and sent back to the sewage line) and other solids are drawn off. A ‘consortium’ of bacteria (different organisms address different sewage constituents including sugars, proteins, fats, etc.) get to work, and produce a malleable bioplastic polystyrene akin to a coffee cup top. “It’s the kind of plastic that can be used in packaging of all kinds,” says Bissell.
The UP! personal 3D printer from China retails for $1500, with goop running at $50/kg. From this early adopter's review: It runs at 0.3mm resolution, and the finished models show striations from successive layers of goop, but light sanding produces a smooth finish. For objects with funny extrusions and sitcky-outie bits that aren't stable until they are fully printed, the printer calculates and adds support struts on the fly, and these have to be removed with a hobby knife after printing.
You can even replicate a 3D printer itself... and best of all... it's reprap open source!